BALANCE SHEETS - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents		$ 834	$ 596
Accounts receivable, net		71,166	71,626
Accounts receivable from affiliates		1,079	1,983
Accrued unbilled revenues		103,781	129,287
Inventories		37,546	43,231
Regulatory assets		31,541	52,006
Derivative instruments		12,952	23,776
Deferred income taxes		35,686	51,854
Prepaid Taxes		35,666	11,273
Prepayments and other		20,520	20,203
Total current assets		350,771	405,835
Property, plant and equipment, net		4,348,823	3,743,141
Other assets
Regulatory assets		301,814	323,305
Derivative instruments		25,272	33,164
Other		15,532	15,859
Total other assets		342,618	372,328
Total assets		5,042,212	4,521,304
Current liabilities
Long-term Debt, Current Maturities		200,000	0
Short-term debt		15,000	37,000
Borrowings under utility money pool arrangement		0	16,000
Accounts payable		146,794	160,762
Accounts payable to affiliates		29,135	19,790
Regulatory liabilities	[1]	98,305	87,723
Taxes accrued		33,374	27,208
Accrued interest		17,781	17,057
Dividends payable		12,538	27,828
Derivative instruments		3,565	3,565
Other		35,654	80,211
Total current liabilities		592,146	477,144
Deferred credits and other liabilities
Deferred income taxes		896,430	849,145
Regulatory liabilities		229,584	115,188
Asset retirement obligations		27,233	26,031
Derivative instruments		27,078	30,643
Pension and employee benefit obligations		93,346	103,670
Other		17,841	9,320
Total deferred credits and other liabilities		$ 1,291,512	$ 1,133,997
Commitments and Contingencies
Capitalization
Long-term debt		$ 1,350,605	$ 1,349,691
Common stock — 200 shares authorized of $1.00 par value; 100 shares outstanding at Dec. 31, 2015 and 2014, respectively		0	0
Additional paid in capital		1,371,223	1,165,463
Retained earnings		438,007	395,998
Accumulated other comprehensive loss		(1,281)	(989)
Total common stockholder’s equity		1,807,949	1,560,472
Total liabilities and equity		$ 5,042,212	$ 4,521,304

[1] Revenue subject to refund of $3.9 million and $51.2 million for 2015 and 2014, respectively, is included in other current liabilities.